Wavelet Coherency Structure in Open Channel Flow
Many studies based on single-point measurement data have demonstrated the impressive ability of wavelet coherency analysis to catch the coherent structures in the wall-bounded flows; however, the question of how the events found by the wavelet coherency analysis relate to the features of the coheren...
Ausführliche Beschreibung
Autor*in: |
Kebing Chen [verfasserIn] Yifan Zhang [verfasserIn] Qiang Zhong [verfasserIn] |
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Format: |
E-Artikel |
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Sprache: |
Englisch |
Erschienen: |
2019 |
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Übergeordnetes Werk: |
In: Water - MDPI AG, 2010, 11(2019), 8, p 1664 |
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Übergeordnetes Werk: |
volume:11 ; year:2019 ; number:8, p 1664 |
Links: |
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DOI / URN: |
10.3390/w11081664 |
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Katalog-ID: |
DOAJ033808708 |
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10.3390/w11081664 doi (DE-627)DOAJ033808708 (DE-599)DOAJ5922f9e9b7a84fd6b0ef5a7122a88281 DE-627 ger DE-627 rakwb eng TC1-978 TD201-500 Kebing Chen verfasserin aut Wavelet Coherency Structure in Open Channel Flow 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Many studies based on single-point measurement data have demonstrated the impressive ability of wavelet coherency analysis to catch the coherent structures in the wall-bounded flows; however, the question of how the events found by the wavelet coherency analysis relate to the features of the coherent structures remains open. Time series of velocity fields in <i<x</i<−<i<y</i< plane of the steady open channel flow was obtained from a time-resolved particle imaging velocimetry system. The local wavelet spectrum found shows that one of the main energetic scales in open channel flows is 3<i<h</i< motions. The wavelet coherent coefficients of <i<u</i< and <i<v</i< series from the same measurement points successfully detected the occurrence and the scale of these 3<i<h</i< motions, and the phase angle indicates their inside velocity structure is organized by the Q2 and Q4 events. The wavelet coherency analysis between different measurement points further reveals the incline feature of the 3<i<h</i< scale motions. All the features of this 3<i<h</i< motion found by the wavelet coherency analysis coincide well with the flow field that is created by the passing of hairpin packets. wavelet coherency Taylor’s frozen turbulence hypothesis scale hairpin vortex packet open channel flow Hydraulic engineering Water supply for domestic and industrial purposes Yifan Zhang verfasserin aut Qiang Zhong verfasserin aut In Water MDPI AG, 2010 11(2019), 8, p 1664 (DE-627)611729008 (DE-600)2521238-2 20734441 nnns volume:11 year:2019 number:8, p 1664 https://doi.org/10.3390/w11081664 kostenfrei https://doaj.org/article/5922f9e9b7a84fd6b0ef5a7122a88281 kostenfrei https://www.mdpi.com/2073-4441/11/8/1664 kostenfrei https://doaj.org/toc/2073-4441 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4367 GBV_ILN_4700 AR 11 2019 8, p 1664 |
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10.3390/w11081664 doi (DE-627)DOAJ033808708 (DE-599)DOAJ5922f9e9b7a84fd6b0ef5a7122a88281 DE-627 ger DE-627 rakwb eng TC1-978 TD201-500 Kebing Chen verfasserin aut Wavelet Coherency Structure in Open Channel Flow 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Many studies based on single-point measurement data have demonstrated the impressive ability of wavelet coherency analysis to catch the coherent structures in the wall-bounded flows; however, the question of how the events found by the wavelet coherency analysis relate to the features of the coherent structures remains open. Time series of velocity fields in <i<x</i<−<i<y</i< plane of the steady open channel flow was obtained from a time-resolved particle imaging velocimetry system. The local wavelet spectrum found shows that one of the main energetic scales in open channel flows is 3<i<h</i< motions. The wavelet coherent coefficients of <i<u</i< and <i<v</i< series from the same measurement points successfully detected the occurrence and the scale of these 3<i<h</i< motions, and the phase angle indicates their inside velocity structure is organized by the Q2 and Q4 events. The wavelet coherency analysis between different measurement points further reveals the incline feature of the 3<i<h</i< scale motions. All the features of this 3<i<h</i< motion found by the wavelet coherency analysis coincide well with the flow field that is created by the passing of hairpin packets. wavelet coherency Taylor’s frozen turbulence hypothesis scale hairpin vortex packet open channel flow Hydraulic engineering Water supply for domestic and industrial purposes Yifan Zhang verfasserin aut Qiang Zhong verfasserin aut In Water MDPI AG, 2010 11(2019), 8, p 1664 (DE-627)611729008 (DE-600)2521238-2 20734441 nnns volume:11 year:2019 number:8, p 1664 https://doi.org/10.3390/w11081664 kostenfrei https://doaj.org/article/5922f9e9b7a84fd6b0ef5a7122a88281 kostenfrei https://www.mdpi.com/2073-4441/11/8/1664 kostenfrei https://doaj.org/toc/2073-4441 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4367 GBV_ILN_4700 AR 11 2019 8, p 1664 |
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10.3390/w11081664 doi (DE-627)DOAJ033808708 (DE-599)DOAJ5922f9e9b7a84fd6b0ef5a7122a88281 DE-627 ger DE-627 rakwb eng TC1-978 TD201-500 Kebing Chen verfasserin aut Wavelet Coherency Structure in Open Channel Flow 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Many studies based on single-point measurement data have demonstrated the impressive ability of wavelet coherency analysis to catch the coherent structures in the wall-bounded flows; however, the question of how the events found by the wavelet coherency analysis relate to the features of the coherent structures remains open. Time series of velocity fields in <i<x</i<−<i<y</i< plane of the steady open channel flow was obtained from a time-resolved particle imaging velocimetry system. The local wavelet spectrum found shows that one of the main energetic scales in open channel flows is 3<i<h</i< motions. The wavelet coherent coefficients of <i<u</i< and <i<v</i< series from the same measurement points successfully detected the occurrence and the scale of these 3<i<h</i< motions, and the phase angle indicates their inside velocity structure is organized by the Q2 and Q4 events. The wavelet coherency analysis between different measurement points further reveals the incline feature of the 3<i<h</i< scale motions. All the features of this 3<i<h</i< motion found by the wavelet coherency analysis coincide well with the flow field that is created by the passing of hairpin packets. wavelet coherency Taylor’s frozen turbulence hypothesis scale hairpin vortex packet open channel flow Hydraulic engineering Water supply for domestic and industrial purposes Yifan Zhang verfasserin aut Qiang Zhong verfasserin aut In Water MDPI AG, 2010 11(2019), 8, p 1664 (DE-627)611729008 (DE-600)2521238-2 20734441 nnns volume:11 year:2019 number:8, p 1664 https://doi.org/10.3390/w11081664 kostenfrei https://doaj.org/article/5922f9e9b7a84fd6b0ef5a7122a88281 kostenfrei https://www.mdpi.com/2073-4441/11/8/1664 kostenfrei https://doaj.org/toc/2073-4441 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4367 GBV_ILN_4700 AR 11 2019 8, p 1664 |
allfieldsSound |
10.3390/w11081664 doi (DE-627)DOAJ033808708 (DE-599)DOAJ5922f9e9b7a84fd6b0ef5a7122a88281 DE-627 ger DE-627 rakwb eng TC1-978 TD201-500 Kebing Chen verfasserin aut Wavelet Coherency Structure in Open Channel Flow 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Many studies based on single-point measurement data have demonstrated the impressive ability of wavelet coherency analysis to catch the coherent structures in the wall-bounded flows; however, the question of how the events found by the wavelet coherency analysis relate to the features of the coherent structures remains open. Time series of velocity fields in <i<x</i<−<i<y</i< plane of the steady open channel flow was obtained from a time-resolved particle imaging velocimetry system. The local wavelet spectrum found shows that one of the main energetic scales in open channel flows is 3<i<h</i< motions. The wavelet coherent coefficients of <i<u</i< and <i<v</i< series from the same measurement points successfully detected the occurrence and the scale of these 3<i<h</i< motions, and the phase angle indicates their inside velocity structure is organized by the Q2 and Q4 events. The wavelet coherency analysis between different measurement points further reveals the incline feature of the 3<i<h</i< scale motions. All the features of this 3<i<h</i< motion found by the wavelet coherency analysis coincide well with the flow field that is created by the passing of hairpin packets. wavelet coherency Taylor’s frozen turbulence hypothesis scale hairpin vortex packet open channel flow Hydraulic engineering Water supply for domestic and industrial purposes Yifan Zhang verfasserin aut Qiang Zhong verfasserin aut In Water MDPI AG, 2010 11(2019), 8, p 1664 (DE-627)611729008 (DE-600)2521238-2 20734441 nnns volume:11 year:2019 number:8, p 1664 https://doi.org/10.3390/w11081664 kostenfrei https://doaj.org/article/5922f9e9b7a84fd6b0ef5a7122a88281 kostenfrei https://www.mdpi.com/2073-4441/11/8/1664 kostenfrei https://doaj.org/toc/2073-4441 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4367 GBV_ILN_4700 AR 11 2019 8, p 1664 |
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Many studies based on single-point measurement data have demonstrated the impressive ability of wavelet coherency analysis to catch the coherent structures in the wall-bounded flows; however, the question of how the events found by the wavelet coherency analysis relate to the features of the coherent structures remains open. Time series of velocity fields in <i<x</i<−<i<y</i< plane of the steady open channel flow was obtained from a time-resolved particle imaging velocimetry system. The local wavelet spectrum found shows that one of the main energetic scales in open channel flows is 3<i<h</i< motions. The wavelet coherent coefficients of <i<u</i< and <i<v</i< series from the same measurement points successfully detected the occurrence and the scale of these 3<i<h</i< motions, and the phase angle indicates their inside velocity structure is organized by the Q2 and Q4 events. The wavelet coherency analysis between different measurement points further reveals the incline feature of the 3<i<h</i< scale motions. All the features of this 3<i<h</i< motion found by the wavelet coherency analysis coincide well with the flow field that is created by the passing of hairpin packets. |
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Many studies based on single-point measurement data have demonstrated the impressive ability of wavelet coherency analysis to catch the coherent structures in the wall-bounded flows; however, the question of how the events found by the wavelet coherency analysis relate to the features of the coherent structures remains open. Time series of velocity fields in <i<x</i<−<i<y</i< plane of the steady open channel flow was obtained from a time-resolved particle imaging velocimetry system. The local wavelet spectrum found shows that one of the main energetic scales in open channel flows is 3<i<h</i< motions. The wavelet coherent coefficients of <i<u</i< and <i<v</i< series from the same measurement points successfully detected the occurrence and the scale of these 3<i<h</i< motions, and the phase angle indicates their inside velocity structure is organized by the Q2 and Q4 events. The wavelet coherency analysis between different measurement points further reveals the incline feature of the 3<i<h</i< scale motions. All the features of this 3<i<h</i< motion found by the wavelet coherency analysis coincide well with the flow field that is created by the passing of hairpin packets. |
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Many studies based on single-point measurement data have demonstrated the impressive ability of wavelet coherency analysis to catch the coherent structures in the wall-bounded flows; however, the question of how the events found by the wavelet coherency analysis relate to the features of the coherent structures remains open. Time series of velocity fields in <i<x</i<−<i<y</i< plane of the steady open channel flow was obtained from a time-resolved particle imaging velocimetry system. The local wavelet spectrum found shows that one of the main energetic scales in open channel flows is 3<i<h</i< motions. The wavelet coherent coefficients of <i<u</i< and <i<v</i< series from the same measurement points successfully detected the occurrence and the scale of these 3<i<h</i< motions, and the phase angle indicates their inside velocity structure is organized by the Q2 and Q4 events. The wavelet coherency analysis between different measurement points further reveals the incline feature of the 3<i<h</i< scale motions. All the features of this 3<i<h</i< motion found by the wavelet coherency analysis coincide well with the flow field that is created by the passing of hairpin packets. |
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